NJM2225S(2004) 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJM2225S
(Rev.:2004)

VIDEO CAMERA AUTO-IRIS FUNCTION

Japan Radio Corporation  

NJM2225

■ EXTERNAL CIRCUIT

EXTERNAL DEVICE

Pin6-Pin7 resistor 2.7kΩ

Pin 7-GND capacitor 3.3µF

Pin 7-L1 resistor 120Ω

Pin8-Pin9 RC

680kΩ, 1kΩ, 0.1µF

Pin8-GND capacitor 1µF

V1+-GND Variable resistor

OPERATION DESCRIPTION

Integrating video luminance signal,

and convert to DC level.

Control iris motor speed.

To prevent miss operation of motor by

vertical synchronous signal, low-pass

filter acts as negative feedback circuit.

AC ground

Set threshold value of iris-motor start.

■ NOTE

● When used at V1+=9V, not connect pin3, pin4, pin10.

-8-

Ver.2004-02-17

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